MIC2843AYMT datasheet(8/13 Pages) MICREL

Part #	MIC2843AYMT

Description	High Efficiency 6 Channel Linear WLED Driver with DAM??and Ultra Fast PWM??Control

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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Micrel Inc.

MIC2843A

June 2009

8

M9999-062909-C

Application Information

Dynamic Average Matching (DAM™)

The Dynamic average matching architecture multiplexes

four voltage references to provide highly accurate LED

current and channel matching. The MIC2843A achieves

industry leading LED channel matching of 1.5% across

the entire dimming range.

Ultra Fast PWM™ Dimming Interface

The MIC2843A supports a wide range of PWM control

signal frequencies from 200Hz to 500kHz. This

extremely wide range of control provides ultimate

flexibility for handheld applications using high frequency

PWM control signals.

WLED dimming is achieved by pulse width modulating

the linear drivers which are controlled by a PWM signal

to the END pin. For PWM frequencies between 200Hz –

20kHz the MIC2843A supports a duty cycle range from

1% to 100%, see Figure3. The MIC2843A incorporates

an internal shutdown delay to ensure that the internal

control circuitry remains active during PWM dimming.

This feature prevents the possibility of backlight

flickering when using low frequency PWM control

signals. The MIC2843A also supports Ultra Fast PWM™

frequencies from 20kHz to 500kHz. Due to input signal

propagation delay, PWM frequencies above 20kHz have

a non-linear relationship between the duty cycle and the

average LED current, see Figures 4 and 5. Figures 6

through 10 show the WLED current response when a

PWM signal is applied to the END pin

(1).

(1) From the low Iq sleep mode PWM frequencies above

15kHz may require a logic high enable signal for 80μs to

first enable the MIC2843A prior to PWM dimming.

Figure 3. Average Current per LED Dimming

by Changing PWM Duty Cycle for PWM Frequencies

up to 20kHz

Figure 4. Channel Current Response to PWM Control

Signal Frequencies from 50kHz to 500kHz

Figure 5. Minimum Duty Cycle

for Varying PWM Frequency

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MIC2843AYMT Datasheet(PDF) 8 Page - Micrel Semiconductor

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